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In EDM process, due to EDM parameter selection of inappropriate, or processing chip discharge is not so good reasons to produce concentrated discharge arcing, such as electric sparks are scarce and red sparks, the electric discharge sound has become irregular, then produce the so-called unstable discharge. Processing is not stable, the processing current is not in accordance with the set of the current work, the working current is small, and in the process of processing will appear a variety of processing defects, resulting in waste. Often the following abnormal discharge phenomenon. (1) the discharge is not stable at the start of the process At the beginning of the processing of graphite electrode, due to the workpiece being chip cutting, burr,…
　Characteristics of graphite 1 light weight: the proportion of 1/5, copper, suitable for the production of large electrodes 2 machine processing performance is good: cutting resistance for copper 1/3 3 surface easy to deal with: no burr after machining, easy manual processing 4 high temperature: when the temperature reached 3650 degrees Celsius, it can withstand higher current. 5 the thermal expansion coefficient is low: 1/4 for copper, and the heat is not deformed 6 discharge machining speed: discharge machining speed than copper block 3~5 times, large area or rough machining more obvious. 7 electrode loss is small: the ratio of the copper and copper is 2:4, it can be processed without damage. Machining method of graphite electrode: 1 tool requirements:…
CNC machining speed, cutting, easy dressing: high speed milling rough machining a copper block 3 times, high speed milling finishing a copper block 5 times, and its strength is very high, for high (50-90mm) ultrathin (0.2 0.5 mm) of the electrode, processing is not easy to deform. Many times the product needs to have good ruled surface effect, which requires to do the whole of the electrode and in the production of the whole electrode exists all sorts of hidden corner cleaning, due to the characteristics of graphite is easy to repair, making this problem is easy to solve, and greatly reduce the electrode number, can realize the complex geometry, and copper is unable to do so Rapid EDM molding,…
